Vehicle Payment Plan Agreement. A vehicle payment plan agreement is a contract between a buyer and seller of a vehicle that agrees to installment payments.Customize and Download this "Bill Of Sale With Payment Plan". Proof of ownership may be a bill of sale, conditional sales contract, out ofstate registration, etc. 4. Selling or transferring ownership of a car, boat or other item of personal property? Easily create, print, and download a Bill of Sale in minutes. Sales and Use Tax Forms and Certificates. Contact Information: North Carolina Department of Revenue PO Box 25000 Raleigh, NC 27640-0640 It may sound complicated, but much of this will be obvious and quick to fill out. It's a fillable PDF that can be customized for additional details.